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Discover LudwigThe phrase "a demonstrator" is correct and usable in written English.
It can be used to refer to a person who demonstrates something, such as a product, a skill, or a concept, often in a teaching or promotional context.
Example: "The company hired a demonstrator to showcase the new features of their latest product at the trade show."
Alternatives: "a presenter" or "a showcase expert".
Exact(60)
A demonstrator at the justice for Sammy Yatim protests in downtown Toronto, August 2013.
A demonstrator raises his fist in front of riot policemen.
"It is not in itself a demonstrator of further moves".
The coach on view (a demonstrator), cost $57,000.
Finally, the results from a "demonstrator string" are presented.
RAMP Blue was the first large-scale RAMP system built as a demonstrator of the ideas.
"It's called Zuccotti lung," said Willie Carey, 28, a demonstrator from Chapel Hill, N.C.
None defended the government's excesses or abuses, including the killing of a demonstrator on Friday night.
Violence didn't erupt until police detained a demonstrator who reportedly had a gun, he said.
"It became a demonstrator site for green parking," Mr. Schmid said.
Keep away from our bodies," read one sign held by a demonstrator.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com